do not drink alcohol in excess with cialis. side effects may include headache, upset stomach, delayed backache or muscle ache. to avoid long-term injury, seek immediate medical help for an erection lasting more than 4 hours. if you have any sudden decrease or loss in hearing or vision, or if you have any allergic reactions such as rash, hives, swelling of the lips, tongue or throat, or difficulty breathing or swallowing, stop taking cialis and get medical help right away. ask your doctor about cialis for daily use and a 30-tablet free trial. every day we're working to and to keep our commitments. and we've made a big commitment to america. bp supports nearly 250,000 jobs here. through all of our energy operations, we invest more in the u.s. than any other place in the world. in fact, we've invested over $55 billion here in the last five years - making bp america's largest energy investor. our commitment has never been stronger. ♪ ♪ so you can get out of your element. so you can explore a new frontier and a different discipl